词条 | setgraphbufsize |
释义 | 函数名: setgraphbufsize 功 能: 改变内部图形缓冲区的大小 用 法: unsigned far setgraphbufsize(unsigned bufsize); 程序例: #include <graphics.h> #include <stdlib.h> #include <stdio.h> #include <conio.h> #define BUFSIZE 1000 /* internal graphics buffer size */ int main(void) { /* request auto detection */ int gdriver = DETECT, gmode, errorcode; int x, y, oldsize; char msg[80]; /* set the size of the internal graphics buffer */ /* before making a call to initgraph. */ oldsize = setgraphbufsize(BUFSIZE); /* initialize graphics and local variables */ initgraph(&gdriver, &gmode, ""); /* read result of initialization */ errorcode = graphresult(); if (errorcode != grOk) /* an error occurred */ { printf("Graphics error: %s\", grapherrormsg(errorcode)); printf("Press any key to halt:"); getch(); exit(1); /* terminate with an error code */ } x = getmaxx() / 2; y = getmaxy() / 2; /* output some messages */ sprintf(msg, "Graphics buffer size: %d", BUFSIZE); settextjustify(CENTER_TEXT, CENTER_TEXT); outtextxy(x, y, msg); sprintf(msg, "Old graphics buffer size: %d", oldsize); outtextxy(x, y+textheight("W"), msg); /* clean up */ getch(); closegraph(); return 0; } |
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